SMD soldering is not all that easy, and let's estimate you need 3 (probably 4 or 5) hours for one board, take the material costs into the equation, as well as having to give a guarantee for the minimig being working for a amount of time. And probably a hundred of other issues as well.
Considering all of that your 50 bucks is no-go.
I can't see many people wanting to go through the hassle of smd soldering with a hourly wage of $3.50.
Why not order the pcb plus all of the required parts, and ask someone professional in your local area to do the job for you. Thats the most realistic approach i currently see for people like you (and me) getting a decently working minimig.
